File Manager: Assorted fixes and polish

File Manager: Assorted fixes and polish

Add chromeish button style
Fix dialog gradient and transitions
Fix harness file creation
Fix task button rendering
Make list header gradient not leak outside of list
Show checkmark even when only a single item is selected (multi-select mode only).
Add a delay to the mock tasks callback to better simulate the real world.

BUG=chromium-os:17028, chromium-os:19373, chromium-os:19693
TEST=manual testing

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98701

[rginda, 2011-08-26 22:41:03]

http://codereview.chromium.org/7764011/diff/1/chrome/browser/resources/file_m...
File chrome/browser/resources/file_manager/css/dialogs.css (right):

http://codereview.chromium.org/7764011/diff/1/chrome/browser/resources/file_m...
chrome/browser/resources/file_manager/css/dialogs.css:15: background:
-webkit-radial-gradient(rgba(127, 127, 127, 0.5),
Background gradient copied from settings code.

http://codereview.chromium.org/7764011/diff/1/chrome/browser/resources/file_m...
File chrome/browser/resources/file_manager/js/mock_chrome.js (left):

http://codereview.chromium.org/7764011/diff/1/chrome/browser/resources/file_m...
chrome/browser/resources/file_manager/js/mock_chrome.js:111:
callback(candidateTasks);
Test harness didn't exhibit the multiple-task-buttons bug because we invoked the
callback synchronously with no delay.

[zel, 2011-08-27 00:09:41]

LGTM

http://codereview.chromium.org/7764011/diff/1/chrome/browser/resources/file_m...
File chrome/browser/resources/file_manager/main.html (right):

http://codereview.chromium.org/7764011/diff/1/chrome/browser/resources/file_m...
chrome/browser/resources/file_manager/main.html:141: <center><img
class=preview-img></center>
we should center in CSS instead